From d8edb51d6afbda3bd4e2512e378d9db8135c6ded Mon Sep 17 00:00:00 2001
From: Peter Cai <peter@typeblog.net>
Date: Thu, 9 Apr 2020 19:18:48 +0800
Subject: [PATCH] add explanation why we need a custom binding

---
 src/lib.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/lib.rs b/src/lib.rs
index 73ab40b..5d8e2d5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -47,6 +47,10 @@ fn build_routes() -> router::Router {
 
 #[wasm_bindgen]
 extern "C" {
+    // This binds to the fetch function in global scope
+    // In cloudflare workers, there's no Window object
+    // and unfortunately the bionding in web_sys depends
+    // on Window being present.
     fn fetch(req: &Request) -> Promise;
 }